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JB Weld Rad Fittings ?

post #1 of 19
Thread Starter 
im looking to use a spare 120x1 rad from an old Big Water kit to help cool the water exiting one of my GTX's before it enters the other....the problem im having is , the largest fittings the Thermaltake rad has are 3/8" with a different threading than standard 1/4 NPT. i use all 1/2" in my loops...i could have my brother (welder) weld some 1/2" fittings to it but brass fittings cannot be welded to steel (rad)...so , do you think i could use JB Weld to bond 1/2" fittings to the rad ????? the rad will be mounted externally so if it leaks it wont be THAT much of a catastrophe...i have used JB Weld many times in the past and it is great stuff , i just never needed the bond to be water tight...opinions please...
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post #2 of 19
thermaltake rads are so bad, I recommend not using it especially if it is anywhere NEAR an 8800 GTX. I lost an 8800 GT from a TT rad leaking. Don't try it.
post #3 of 19
JB Weld is water tight.

However, those TT rads do suck.... they use oil/condensor type rads which suck for PC cooling.
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post #4 of 19
Thread Starter 
Quote:
thermaltake rads are so bad, I recommend not using it especially if it is anywhere NEAR an 8800 GTX. I lost an 8800 GT from a TT rad leaking. Don't try it.
well , i want to put it between the two graphics cards .....water out of the first card will go through this rad before going back into the second card. the way i have it now is the water from the first card comes out and then directly back into the second card...i dont care how bad people think Thermaltake stuff is , it will definetely help cool the water before it goes back into the second GTX. i had this same rad cooling an x2 3700+ clocked to 2.7 ghz and it cooled very nicely...i have long since upgraded my loop to much better components though.
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post #5 of 19
Quote:
Originally Posted by xtcrulez View Post
well , i want to put it between the two graphics cards .....water out of the first card will go through this rad before going back into the second card. the way i have it now is the water from the first card comes out and then directly back into the second card...i dont care how bad people think Thermaltake stuff is , it will definetely help cool the water before it goes back into the second GTX. i had this same rad cooling an x2 3700+ clocked to 2.7 ghz and it cooled very nicely...i have long since upgraded my loop to much better components though.
Watercooling doesn't work like that. Radiator location doesn't matter (much). It's not like the water coming out of the rad is really "cooler".
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post #6 of 19
As DH stated, yes it's water tight.....I used JB Weld once to fix a cracked carburetor bowl on my motorcycle. Hasn't leaked since and that was about 3 yrs ago.

I would at least run a leak test before it goes into real service.
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post #7 of 19
Thread Starter 
Quote:
Watercooling doesn't work like that. Radiator location doesn't matter (much). It's not like the water coming out of the rad is really "cooler".
this would be the second rad in my GPU loop.....and if water doesnt come out of a rad cooler than it went in , whats the point of using them ? lol.....
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post #8 of 19
Quote:
Originally Posted by xtcrulez View Post
this would be the second rad in my GPU loop.....and if water doesnt come out of a rad cooler than it went in , whats the point of using them ? lol.....
The temperature difference between the inlet and outlet are marginal. Don't forget how fast the water is moving. The entire loop's temperature will become closer to ambient. If you pour a cup of hot water into a rad, does it come out room temperature? No. If your hot water cycles through the rad in a closed loop, the loop becomes room temperature.
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post #9 of 19
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so with that said , how would i go about doing this?? i really want to cool the hot water exiting my first gpu before it goes into the second card.....i posted about this a few weeks back and Ira-K suggested i put another rad between the 2 cards...
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post #10 of 19
Quote:
Originally Posted by xtcrulez View Post
so with that said , how would i go about doing this?? i really want to cool the hot water exiting my first gpu before it goes into the second card.....i posted about this a few weeks back and Ira-K suggested i put another rad between the 2 cards...
It really doesn't matter where you put in the loop. It's physics....

http://www.bit-tech.net/hardware/200...rcooling_101/7
Quote:
Before you go anywhere, you should probably think of how you'll put it all together. See, there's a funny little catch to all of this - though it seems like the traditional model of Pump -> Block -> Rad -> Res is that way for a reason, it actually has little effect.

Despite one part of your loop getting what seems to be slightly preferential cooling treatment (right after the radiator), the overall water temperature won't change much at all. Why? Well, a closed system will always reach a state of equilibrium. The cooling from the radiator will draw heat from the entire system by convection and conduction, as well as other topics that are well above the scope of this guide. Suffice it to say that though your CPU might get a half a degree cooler by putting it directly after your radiator - but if it's even that much, I'd be surprised.
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